'while' in list comprehension?

[Alex Martelli]

Greg Ewing (using news.cis.dfn.de) wrote:

> Hannu Kankaanp?? wrote:
>> Another variation:
>> 
>> foo = [i for i in bar, break if len(i) == 0]
>> 
>> This wouldn't need a new keyword.
> 
> My thoughts on all this are that if you want to do
> something that procedural, it would be better written
> out as nested statements. List comprehensions are
> meant to be read declaratively.

Yes, they are.  Still,

[ i for i in bar while len(i) ]

DOES read pretty declaratively to me (while the "break"
version admittedly doesn't).


Alex